Impeller for vibrators for crushers, etc.



July 1929. B. A. MITCHELL 1.719.123

IMPELLER FOR-VIBRATORS FOR CRUSHERS, ETC

Filed March 2,. 1928 2 sheets-sheet l 'MW M mi 1 Y a M 1H l* H M l" illif I `ll Ig'* 1 I l f H l 1 l l 45/ E :N 437 l: g il 4 l f Q a l f i l 1451' l 460 l i I 47 u@ 471i Y. a M "f M July 2, 1929- BQ A. MlTcHELL1.719323 IMVPELLER FOR VIBRATORS FOR CRUSHERS, ETC

Filed March 2, 192B 2 Sheets-Sheet 2 vwemto'c /3 a M@ @MMM Wwf@ MMMPatented July 2, 1929.

UNITED STATES Luana NPATENT ortica.

BENJAMIN A. MITCHELL, OF TOMPKINSVILLE, :NEW YORK.

IMPE'LLER FOR VBhATORS FOR CRSEIERS, ETC.

Application filed March 2,

le pellei' and within a race-Way carried by the ineniber which is to bevibrated or gyrated. In the operation ot such devices, when operated atthe high speed at Which they are designed to operate, say 3500 ll. P.M., it has if, been found that when the ball is carried in a recess ofthe inipeller the driving surface is subject to excessive Wear and to apeening action which increases the contact surface and tends to displacethe ball troni its proper zo path, With resultant increase oii'frictionand Wear and development et beat. In the continued practical operationot suoli devices it has been found that this diliiculty can be overcomeby the provision in the iinpeller ot a Contact ineinber for the ballwhich shall lbe yielding; and preferably so subject to centrifugalaction that the force applied through it 'to the ball shall increasewith the speed et the iinpeller. In the incre practical einbodiinent etthe invention, therefore, the contact nieniber is pivotally hung on theinipeller. lt will be understood that the Weight ed body which isindependent ol the iinpeller and is driven by the inipellei and whoseinass is eccentric to the axis et the iinpeller niay take the torni o1 acylindrical roller, for example, or seine other suitable form, and thatthe terni ball is used herein for convenience and not as restricting theinvenio tion to the use of a spherical body.

In the accompanying drawings in which the invention is illustrated-Figure 1 is a view in sectional elevation showing; so inuch of acruslier as is necessary e5 to enable the application ot the inventionthereto to be understood.

Figure 2 is a detail View on the plane indicated by the broken line 2-2Ot F igure 1 and on a somewhat larger scale.

Figure 3 is a vievv in sectional elevation et a vibrator designedparticularly ,tor application to a screen and embodying' the presentinvention. l

Figure d is a view in section on the plane indicated by the broken linet-l et Figure 8.

.ln the embodiment ot the invention shown 192s. serial no. 258,537.

in Figures 1 and 2, in which the invention illustrated as applied to theg'yratory crusher such as that shown in Letters Patent No. 1,557,307,the relatively lined Crusher ineinber 15 is surinouiited by a trame 16which .supports a housing 28 tor a motor by which inay be driven theshaft L15@ which cai'iries the iinpeller l5. Vbluppm'ted trein thetraine, so as to be capable of gyratory inoveincnt, is the relativelyinovable ineniber 20 et the Crusher, this gyratory or vibratoiy ineinbercarrying the internal race-Ways 48 with which coact, under the influenceoit centrifugal action, the balls or intermediate inem-- bers 46.

1n the construction shown :in said Letters Patent No. 1,557,307, theballs 11G are received in recesses et the inipeller 415, but in thepresent instance thein'ipeller is inade up ct a series of plates L15btransverse to theV axis of the shaft L15:L and secured thereto so as toArotate therewith. `The plates are shown as spaced by sirvacingsleevesL15c to receive between thein the balls 16. ln each ball receiving'space between the plates l15" is placed a yielding contact ineniber 11:7which is shown as a plate or Wingpivotally mounted, as at 4:7, betweenadjacent plates and provided, it inay'be, With a Wear plate lli'b. Studs15d inay be provided to limit the baclnvard swine; ot the plates L17,two of such studs being' shown as placed in diainetrically oppositeposition in each ball. space in order that the `iinpeller inay bebalanced ln the operation. olf the ii'npellei' as slioivii in Figures 1and 2, when the rotation is slow, as in starting', the contact ineinbcrs17 norn'ially rest against the studs 15d, with the balls 4:6 restingagainst thein. As the speed oi the iinpeller increases and approachesits iiiaxiinuin the contact ineinbers l'i' tend to assinne radialpositions, driving); the balls bel'ore tliein but being tree to yield tosuch relative backward movements et the balls as inay take place and infact do taire place in eperllO In thel construction there shown agenerally cylindrical housing 50 is supported at its middle portion soas to be capable of vibratory or gyratory movement about its center,being, in this case, themember to which the vibratory or gyratorymovement is imparted. It receives a motor 51 by which rapid rotation isimparted to the impeller shaft 52, supported in suitable bearings in thehousing 50. Also mounted in the housing 5() are race-ways 481 forcoaction, under the influence of centrifugal action, with theindependent balls or intermediate members 461. At each end of the shaft52 is an impeller 451 which consists oplates 451, which form betweenthem a ball receiving space, a spacing sleeve 451, and yielding contactmembers 471 pivotally mounted, as at 471, between the plates 451, and,it may be, provided each with a wear plate 471". Studs 451l may beprovided to limit the backward swinlg` of the plates 471, two suolistuds being provided in order to balance the impeller. The operation ofthe improved impeller is the same as that of the impeller shown inFigures 1 and 2 and need not be further explained.

I claim as my invention:

1. The combination` of a rotatable shaft, a member tobe vibrated andhaving an internal race-way, an intermediate body to eoact with therace-Way and subject'to centrifugal action, and a yielding'contactinember carried with the shaft for couction with the intermediatebody.

2. The combination of a rotatable shaft, a member to be Vibrated andhavin lr an internal race-way, an intermediate body to coact with therace-way and subject to centrifugal action, and a pivotal] y mountedcontact member carried with t-he shaft for c0- action with theintermediate body.

3. The combination of a rotatable shaft, a member to be vibrated andhaving an internal race-way, an intermediate body to coact with therace-way and subject to centrifugal action, plates secured to the shaftto form a receivingv space for the intermediate body, and a yieldingcontact member carried by said plates for coaction with the intermediatebody.

4. The combination of a rotatable shaft, a member to be vibrated andhaving an internal race-way, an intermediate body to court with therace-way and subject to centrifugal action, plates secured to the shaftto forni a. receiving space for the intermediate body, and a contactmember pivotally mounted between said plates to be subject tocentrifugal action for coaction with the intermediate body.

This specification signed this 28th day of February A. D. 1928.

BENJAMIN A. MITCHELL.

